package com.itheima.reggie.controller;


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import com.itheima.reggie.common.R;
import com.itheima.reggie.dto.DishDto;
import com.itheima.reggie.entity.Category;
import com.itheima.reggie.entity.Dish;
import com.itheima.reggie.entity.DishFlavor;
import com.itheima.reggie.service.CategoryService;
import com.itheima.reggie.service.DishFlavorService;
import com.itheima.reggie.service.DishService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.RedisTemplate;
import org.springframework.web.bind.annotation.*;

import java.util.Iterator;
import java.util.List;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.spi.LocaleServiceProvider;
import java.util.stream.Collectors;


/**
 * 菜品管理
 */
@RestController
@Slf4j
@RequestMapping("/dish")
public class DishController {

    @Autowired
    private DishService dishService;

    @Autowired
    private DishFlavorService dishFlavorService;

    @Autowired
    private CategoryService categoryService;

    @Autowired
    private RedisTemplate redisTemplate;


    @PostMapping
    public R<String> save(@RequestBody DishDto dishDto) {
        log.info( "数据为{}", dishDto.toString() );


        dishService.saveWithFlavor( dishDto );

        //清理某个分类下的菜品缓存数据
        String key = "dish_"+dishDto.getCategoryId()+"_1";
        redisTemplate.delete( key );


        return R.success( "新增菜品成功" );
    }


    /**
     * 菜品信息分页查询
     *
     * @param page
     * @param pageSize
     * @param name
     * @return
     */
    @GetMapping("/page")
    public R<Page> page(int page, int pageSize, String name) {

        //构造分页构造器对象
        Page<Dish> pageInfo = new Page<>( page, pageSize );
        Page<DishDto> dishDtoPage = new Page<>();

        //条件构造器
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        //添加过滤条件
        queryWrapper.like( name != null, Dish::getName, name );
        //添加排序条件
        queryWrapper.orderByDesc( Dish::getUpdateTime );

        //执行分页查询
        dishService.page( pageInfo, queryWrapper );

        //对象拷贝
        BeanUtils.copyProperties( pageInfo, dishDtoPage, "records" );

        List<Dish> records = pageInfo.getRecords();

        List<DishDto> list = records.stream().map( (item) -> {
            DishDto dishDto = new DishDto();

            BeanUtils.copyProperties( item, dishDto );

            Long categoryId = item.getCategoryId();//分类id
            //根据id查询分类对象
            Category category = categoryService.getById( categoryId );

            if (category != null) {
                String categoryName = category.getName();
                dishDto.setCategoryName( categoryName );
            }
            return dishDto;
        } ).collect( Collectors.toList() );

        dishDtoPage.setRecords( list );

        return R.success( dishDtoPage );
    }


    /**
     * 根据id查询菜品信息和对应的口味信息
     *
     * @param id
     * @return
     */
    @GetMapping("/{id}")
    public R<DishDto> get(@PathVariable Long id) {
        DishDto dishDto = dishService.getByIdWithFlavor( id );

        return R.success( dishDto );
    }


    /**
     * 再菜品分类点击保存进行修改
     */
    @PutMapping
    public R<String> update(@RequestBody DishDto dishDto) {

        log.info( dishDto.toString() );

        dishService.updateWithFlavor( dishDto );



        //清除所有菜品的缓存数据
        Set keys = redisTemplate.keys( "dish_*" );
        redisTemplate.delete( keys );


        return R.success( "保存成功，新增菜品成功" );
    }


    /**
     * 根据条件查询对应的菜品数据
     *
     */
//    @GetMapping("/list")
//    public R<List<Dish>> list(Dish dish){
//
//
//        LambdaQueryWrapper <Dish>queryWrapper =  new LambdaQueryWrapper<>();
//        queryWrapper.eq( dish.getCategoryId()!=null,Dish::getCategoryId,dish.getCategoryId() );
//
//        //查询状态1，起售的菜品
//        queryWrapper.eq( Dish::getStatus,1 );
//
//
//        //添加排序条件
//        queryWrapper.orderByAsc( Dish::getSort ).orderByDesc( Dish::getUpdateTime );
//
//        List<Dish> list = dishService.list( queryWrapper );
//
//
//
//        return R.success( list );
//    }
    @GetMapping("/list")
    public R<List<DishDto>> list(Dish dish){


        List<DishDto> dishDtoList = null;

        //动态构造key
        String key = "dish_"+dish.getCategoryId()+"_"+dish.getStatus();//dish_199595959595_1


        //先从redis中获取缓存数据
        dishDtoList = (List<DishDto>) redisTemplate.opsForValue().get( key );


        if (dishDtoList!=null){

            //如果存在，直接返回，无需查询数据库
            return R.success( dishDtoList );
        }







        //构造查询条件
        LambdaQueryWrapper<Dish> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(dish.getCategoryId() != null ,Dish::getCategoryId,dish.getCategoryId());
        //添加条件，查询状态为1（起售状态）的菜品
        queryWrapper.eq(Dish::getStatus,1);

        //添加排序条件
        queryWrapper.orderByAsc(Dish::getSort).orderByDesc(Dish::getUpdateTime);

        List<Dish> list = dishService.list(queryWrapper);

        dishDtoList = list.stream().map((item) -> {
            DishDto dishDto = new DishDto();

            BeanUtils.copyProperties(item,dishDto);

            Long categoryId = item.getCategoryId();//分类id
            //根据id查询分类对象
            Category category = categoryService.getById(categoryId);


            if(category != null){
                String categoryName = category.getName();
                dishDto.setCategoryName(categoryName);
            }

            //当前菜品的id
            Long dishId = item.getId();
            LambdaQueryWrapper<DishFlavor> lambdaQueryWrapper = new LambdaQueryWrapper<>();
            lambdaQueryWrapper.eq(DishFlavor::getDishId,dishId);
            //SQL:select * from dish_flavor where dish_id = ?
            List<DishFlavor> dishFlavorList = dishFlavorService.list(lambdaQueryWrapper);
            dishDto.setFlavors(dishFlavorList);
            return dishDto;
        }).collect(Collectors.toList());



        //如果不存在需要查询数据库，将查询到的菜品数据缓存到redis
        redisTemplate.opsForValue().set( key,dishDtoList,60, TimeUnit.MINUTES );

        return R.success(dishDtoList);
    }


}
